There are a total of 12 cattributes for any cat, including pattern, mouth shape, fur, eye shape, base color, accent color, highlight color, eye color, and optional wild, environment, 'purrstige' and 'secret'. Several traits can be passed down from the parents to the offspring. The virtual cats are breedable and carry a unique number and 256-bit distinct genome with DNA and different attributes (known as 'cattributes') that can be passed to offspring. Players must purchase Ether cryptocurrency to join the game, and spend it to perform each breeding and trade action within the game. Players purchase, breed and trade virtual cats that have different visual features of varying levels of rarity. CryptoKitties is the first major game to use blockchains, and one of the earliest examples of a blockchain project designed for recreation. Both companies are based in Vancouver, Canada. The game's popularity in December 2017 congested the Ethereum network, causing it to reach an all-time high in the number of transactions and slowing it down significantly. The game allows players to buy, sell, and create NFTs using on Ethereum. CryptoKitties is a blockchain game developed by Canadian studio Dapper Labs.

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